Imperial County Climate
Imperial County, California
Avg Annual Temp
73.7°F
Annual Precip
3.0"
Annual Snowfall
0.0"
Extreme Heat Days
180.06
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Imperial County Weather
An Extreme Desert Environment
Imperial County is one of the hottest places in the United States with a 73.7°F annual average. Its desert climate is defined by extreme aridity, receiving only 3.0 inches of precipitation per year.
Hotter Than the State Average
At 73.7°F, Imperial is significantly hotter than the California state average of 58.7°F. It represents the extreme thermal ceiling of the state’s low-desert regions.
Unmatched Heat in the Region
Imperial is even hotter and drier than neighboring Riverside County, enduring a staggering 180 days of temperatures over 90°F. It lacks the higher elevation cooling found in parts of the adjacent San Diego County.
Brutal Summers and Warm Winters
Summers are brutal with a 90.4°F average and zero snowfall year-round. Even "winter" is warm by national standards, maintaining a comfortable 57.1°F average from December through February.
Safety in Half-Year Heat
Cooling systems must be heavy-duty to survive six months of extreme heat days above 90°F. Sun protection and constant hydration are critical for anyone spending time outdoors in this 3-inch-rainfall environment.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.